Home > American Minerals IV – August 26 > MS1637 Analcime


Analcime is a hydrated sodium aluminum silicate, and a member of the zeolite group (Coombs et al., 1997). Haüy (1787) named the mineral using Greek root analkis for weak, alluding to its weakly electrostatic nature.

On a small fragment of basalt, two choice analcime crystals have perched precariously. The crystal form is trapezohedral; the largest measures 14 mm across and the other 13 mm across. A third analcime crystal, 7 mm across, formed in the gap between the two larger crystals. The crystal cores are transparent, but near-surface inclusions impart a frosted appearance. Nice for the species. This specimen was part of the Charles Trantham (1936-2020) estate.

Price: $45

Item code: MS1637

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